Big Boy 4014 at Marlin, Texas - Departure October 9, 2024 

Why tf are you not reading the name on the engine's face/smoke box door?

4014. I'm not sure if 4015 is still around.

And plus it's not a big boy, it's a half-assed diesel

You're thinking about Challenger 3985, which came through here in 1992, headed to and from the Republican National Convention in Houston. It also made a side trip to San Antonio. That Challenger is now owned by a railroad preservation group in Illinois, operating out of the old Rock Island Silvis Shops.